Home FAQ I replaced my computer or network card and lost access. Why? PT Target Audience: Iscte-IUL CommunityAnswer/Solution:Network access is linked to the network card MAC Address. If you change computers, internal cards or adapters, you must register the new MAC Address.Further Information:Click here Related Previous Can I use USB-to-Ethernet adapters? Next I entered the MAC address, but I'm still not connected. Is that usual?